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Hurricane Irma Sept 10, 2017

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Hurricane Irma Sept 10, 2017 Post Hurricane-Irma ecological assessments Nicholas G. Aumen US Geological Survey On behalf of many scientists April 25, 2018 Caveats and comments • The Science Coordination Group sponsored a meeting on post-Irma studies on 9/27/2017; approximately 100 individuals participated • I have tried to focus on actual observations and data • Much important information had to be eliminated or condensed due to presentation time constraints • Any errors of omission or commission are mine and mine alone • Numerous individuals, agencies, and academic institutions contributed information to this presentation • Many thanks to all of those who took time out of their busy schedules to pull together and share this information! Category 2-3 115 mph winds >8 ft storm surge HURRICANE IRMA CROSSES FLORIDA ON 10 SEPTEMBER 2017 (Evelyn Gaiser, FIU) Irma’s path and lateral extent of hurricane- force winds Sept. 10, 2017 Miles Meyer, FWS Coastal Emergency Risks Assessment models and data from staff gauges throughout the Everglades suggest a 3+ meter storm surge (courtesy of Keqi Zhang, FIU) Maximum storm tide computed by the ADCIRC model (http://nc- cera.renci.org). Sept 12, 2017 Hx Irma Irma resulted in an enormous amount of sediment transport that can have negative (burial) or positive (exhumation of hard substratum) effects on ecological recovery of reefs. Kissimmee River restoration area Starvation Slough (130 cfs, 5/30/17) Starvation slough (7200 cfs, 9/13/2017) 7 Impacts • Periods of low DO for 2 months – below 2 mg/L • Largemouth bass, bluegill, and other sunfish were negatively affected • Largemouth bass in particular were almost non-existent in surveys conducted after Irma • On the other hand, bluegill numbers were very high post-Irma, possibly benefitting from increased floodplain area and refugia • The invasive West Indian marsh grass may have been reduced by prolonged deep water and high flows during Irma Hurricane Irma Seiche in Lake Okeechobee Lake Okeechobee Stage Time Series 20 18 16 14 StageNGVD)(ft L005 12 LZ40 S131-T S133-T S2-T 10 S352-H Sat 09 0:00:00 Sun 10 0:00:00 Mon 11 0:00:00 Tue 12 0:00:00 September 2017 9 Lake Okeechobee Impacts from Hurricane Irma S191 Resuspended Lake Sediment Taylor Creek/Nubbin Slough Inflows S191 Lake Okeechobee 10 St. Lucie Estuary Dead oysters from monitoring site in middle fork Dying oyster 11 Impacts of Hurricane Irma New Pass in Estero Bay New Pass Coastal re-sculpting at New Pass on Estero Bay Photographs provided by: James Douglass, PhD Assistant Professor, Florida Gulf Coast University 12 Caloosahatchee Estuary Local Basin Watershed Discharges (No Lake Okeechobee Releases) Ft. Myers Beach Sanibel Island Photographs taken September 18, 2017 13 Everglades Stormwater Treatment Areas Water Depths . STAs treated ~200,000 ac-ft (9/17/2017) EAV Cells SAV Cells inflows associated with 4.5 Hurricane Irma 4.1 Normal Target 4.0 3.5 . STA water depths after 3.0 2.9 Hurricane Irma are above 3.0 2.8 2.7 target but not as high as 2.5 2.4 2.1 2.3 June depths 2.0 Average Water Depth (ft) Water Average 2.0 1.8 1.5 1.0 0.5 0.0 STA-1E STA-1W STA-2 STA-3/4 STA-5/6 Includes preliminary data 14 Impacts from Hurricane Irma Biscayne Bay / Card Sound Typical seagrass patch Patches of Seagrass ripped from roots and floating into Biscayne Bay from Card Sound Photographs taken September 20, 2017 Floating Flotsam 15 Everglades Water Depth Maps – Hurricane Irma Pre-Irma: Post-Irma: 09/08/2017 09/12/2017 WCA-1 WCA-1 Rotenberger/ EAA Rotenberger/ EAA Holeyland Holeyland WCA-2 WCA-2 Big Big Cypress Cypress WCA-3 WCA-3 ENP ENP Water Depth (feet) <-2.5’ 0.0’ 2.5’ 5.0’10’>15’ Below Above Ground Ground 16 Flood waters - Highest on record - new bridges allowed emergency ops Flood waters - Highest on record - new bridges allowed emergency ops Photo: E. Gaiser Wood Stork Colony, WCA-3A Hurricane Damage 857 stork nests, May 2017 Irma damage to colony 19 Florida Bay 09-10-17 Prior to the storm’s passage there was no standing water between the Key Largo Interagency Science Center and Pelican Key in Florida Bay. (photo courtesy of Tom Frankovich, FIU) Florida Bay 09-10-17 Prior to the storm’s passage there was no standing water between the Key Largo Interagency Science Center and Pelican Key in Florida Bay. (photo courtesy of Tom Frankovich, FIU) Storm Deposit - Up to 10 cm of Gulf of Mexico mud ~ 100 years of forest accumulation Mud deposit 3 x P Briehgraupt Mangrove soil Photos: J. Shark River We are tracking over 200 fish throughout the Everglades and documenting impacts on their movements and feeding behavior. (photo courtesy of Jennifer Rehage, FIU) Impacts of Hurricane Irma on the Everglades • What was the extent of the storm surge? • Mangroves significantly attenuated the >6 ft storm surge and trapped a storm deposit up to 10 km inland. We need to measure the extent of this deposit to improve storm surge models. • The storm deposit should facilitate forest recovery as it did after H. Wilma, and improve the forest’s resilience to saltwater intrusion. • What was the impact of storm winds? • The riverine forest was defoliated while the scrub forest remained intact. Windrows apparent throughout the marsh. • Over $150k in replacement costs requested to FEMA and funding agencies. • What was the impact of rainfall/runoff? • We are assessing impacts of massive rainfall and runoff on water quality and coastal algal bloom dynamics. • Our consumer array should help track effects of the storm on mortality, behavior and feeding. Offshore reefs • Joanna Walczak, DEP • Joss Voss, HBOI Initial results • Large slabs of Anastasia reef flipped over, killing thousands of Gorgonian corals • Tires and other debris washed offshore • Nearshore Staghorn coral patch scoured badly; none of the large coral colonies on the St. Lucie reef are alive anymore (already impacted by disease) • NOAA, FDEP, FWC, and others are coordinating a Florida Reef Tract- wide assessment of storm injury and coral disease status • Water quality samples are being collected monthly at 115 sites from Port of Miami to St. Lucie Inlet Input from ECISMA (Everglades Cooperative Invasive Species Management Area) • Tegus hunkered down. Even with high water levels, the population seems intact. May be starting early brumation • Post-Irma debris movement may cause invasive plants and animals to appear in new areas. ECISMA may try to monitor debris storage sites • Evidence that citizens surrendered invasive species pets pre-Irma knowing that they could not take them to shelters or on an evacuation • Defoliation may increase visibility of invasive exotic species Impacts on Snail Kites • A total of 48 nests failed due to Irma; 44 of these nests in Lake Okeechobee, the others in WMAs and WCAs • The nests were determined to be failed by a UF survey crew • They estimated they observed about 25% fewer kites than on previous visit on Sept. 6 • Lots of dead willow and cattail, which are where nests were located • Very high lake levels likely exacerbating impacts Summary • Irma had significant ecological impacts, not unexpected from a storm of this magnitude • Major surge on SW coast and in Lake Okeechobee • Surge on SW coast caused mangrove canopy damage, but deposited significant amounts of new sediment inland • Hurricanes are a natural feature of south Florida and are a part of ecological succession. But, do human impacts affect the way the Everglades responds to natural events? Source information • South Florida Water Management District (https://www.sfwmd.gov/science-data/irma-eco-effects) • Evelyn Gaiser and colleagues, Florida International University • Marla Hamilton, Miles Meyer, US Fish and Wildlife Service • James Douglass, Florida Gulf Coast University • Joanna Walczak, Florida Department of Environmental Protection • Joss Voss, Harbor Branch Oceanographic Institute • Everglades Cooperative Invasive Species Management Area.
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